一类高透明含氟共聚型聚酰亚胺的合成与表征

Synthesis and Characterization of Highly Transparent Fluorinated Copolymer Polyimide

摘要:

以2,2'-双(三氟甲基)-4,4'-二氨基联苯(TFMB)、4,4-二氨基二苯醚(ODA)和3, 3',4,4'-二苯醚四甲酸二酐(ODPA)为原料，间甲酚为溶剂，按不同的配比，采用一步法制备了一系列低成本含氟共聚型聚酰亚胺：CPI-1~CPI-4。通过红外光谱仪、核磁共振波谱仪对该系列含氟聚酰亚胺的结构进行了表征确认。该系列含氟聚酰亚胺室温下能溶于DMSO、DMAc、CHCl3等有机溶剂，具有较好的溶解性和成膜性。所制薄膜具有优良的光学透明性，在紫外光波长400 nm时的透光率均在70%以上。该系列含氟聚酰亚胺还具有优异的热稳定性，起始分解温度均大于500 ℃，N2氛围下800 ℃的质量残留百分数均在52%以上，玻璃化转变温度在166-170 ℃范围内。此外，该类聚酰亚胺薄膜的拉伸强度在89.8~105.3 MPa，弹性模量在1.3~1.7 GPa之间，断裂伸长率在9.7~18.4%范围内，表现出了较好的机械性能。

Abstract:

A series of low-cost fluorine-containing co-polyimides CPI-1~CPI-4 are prepared using 2,2'-bis(trifluoromethyl)benzidine (TFMB),4,4'-Oxydianiline (ODA) and 3,3',4,4'-Diphenyl ether tetracar-boxylic acid dianhydride (ODPA) as monomers and m-cresol as a solvent. The structure of this series of fluorinated co-polyimides were characterized by infrared spectrometer, nuclear magnetic resonance spec-tromete. The series of fluorine-containing co-polyimides can be dissolved in organic solvents such as DMSO, DMAc and CHCl3 at room temperature, and have good solubility and film forming properties. The prepared film has excellent optical transparency, and the light transmittance at a wavelength of ultraviolet light of 400 nm is more than 70%.The series of fluorine-containing co-polyimides also have excellent thermal stability, the initial decomposition temperature is more than 500 ?C, the mass residual percentage at 800 ?C in N2 atmosphere is above 52%, and the glass transition temperature is in the range of 166-170 ?C.In addition,these kinds of the co-polyimide film prepared in the tensile strength of 89.8~105.3 MPa, an elastic modulus between 1.3 ~ 1.7 GPa, the elongation at break in the range of 9.7 to 18.4%, showing good mechanical properties.